public static NativeImage ToMultiResolutionImage(this IDrawable drawable, int width, int height)
{
if (drawable == null)
{
return(null);
}
var normalImage = drawable.ToImage(width, height);
var normalNativeImage = normalImage.AsNSImage();
var normalImageData = normalNativeImage.AsTiff();
var normalImageRep = (NSBitmapImageRep)NSBitmapImageRep.ImageRepFromData(normalImageData);
var retinaImage = drawable.ToImage(width * 2, height * 2, 2);
var retinaNativeImage = retinaImage.AsNSImage();
var retinaImageData = retinaNativeImage.AsTiff();
var retinaImageRep = (NSBitmapImageRep)NSBitmapImageRep.ImageRepFromData(retinaImageData);
var combinedImage = new NSImage {
MatchesOnMultipleResolution = true
};
combinedImage.AddRepresentations(new NSImageRep[] { normalImageRep, retinaImageRep });
return(new NativeImage(combinedImage));
}
public static Image ToImage(this NSImage img)
{
using (var imageData = img.AsTiff()) {
var imgRep = NSBitmapImageRep.ImageRepFromData(imageData) as NSBitmapImageRep;
var imageProps = new NSDictionary();
var data = imgRep.RepresentationUsingTypeProperties(NSBitmapImageFileType.Png, imageProps);
return(Image.FromStream(data.AsStream()));
}
}
public override object CreateImage(object backend)
{
var gc = (CGContextBackend)backend;
var img = new NSImage(((CGBitmapContext)gc.Context).ToImage(), gc.Size);
var imageData = img.AsTiff();
var imageRep = (NSBitmapImageRep)NSBitmapImageRep.ImageRepFromData(imageData);
var im = new NSImage();
im.AddRepresentation(imageRep);
return(im);
}
public override object RenderWidget(Widget w)
{
var view = ((ViewBackend)w.GetBackend()).Widget;
view.LockFocus();
var img = new NSImage(view.DataWithPdfInsideRect(view.Bounds));
var imageData = img.AsTiff();
var imageRep = (NSBitmapImageRep)NSBitmapImageRep.ImageRepFromData(imageData);
var im = new NSImage();
im.AddRepresentation(imageRep);
im.Size = new CGSize((nfloat)view.Bounds.Width, (nfloat)view.Bounds.Height);
return(im);
}
public override object ConvertToBitmap(object handle, int pixelWidth, int pixelHeight, ImageFormat format)
{
if (handle is CustomImage)
{
var flags = CGBitmapFlags.ByteOrderDefault;
int bytesPerRow;
switch (format)
{
case ImageFormat.ARGB32:
bytesPerRow = pixelWidth * 4;
flags |= CGBitmapFlags.PremultipliedFirst;
break;
case ImageFormat.RGB24:
bytesPerRow = pixelWidth * 3;
flags |= CGBitmapFlags.None;
break;
default:
throw new NotImplementedException("ImageFormat: " + format.ToString());
}
var bmp = new CGBitmapContext(IntPtr.Zero, pixelWidth, pixelHeight, 8, bytesPerRow, Util.DeviceRGBColorSpace, flags);
bmp.TranslateCTM(0, pixelHeight);
bmp.ScaleCTM(1, -1);
var ctx = new CGContextBackend {
Context = bmp,
Size = new SizeF(pixelWidth, pixelHeight),
InverseViewTransform = bmp.GetCTM().Invert()
};
var ci = (CustomImage)handle;
ci.DrawInContext(ctx);
var img = new NSImage(((CGBitmapContext)bmp).ToImage(), new SizeF(pixelWidth, pixelHeight));
var imageData = img.AsTiff();
var imageRep = (NSBitmapImageRep)NSBitmapImageRep.ImageRepFromData(imageData);
var im = new NSImage();
im.AddRepresentation(imageRep);
return(im);
}
else
{
return(handle);
}
}
public override void SaveToStream(object backend, System.IO.Stream stream, ImageFileType fileType)
{
NSImage img = backend as NSImage;
if (img == null)
{
throw new NotSupportedException();
}
var imageData = img.AsTiff();
var imageRep = (NSBitmapImageRep)NSBitmapImageRep.ImageRepFromData(imageData);
var props = new NSDictionary();
imageData = imageRep.RepresentationUsingTypeProperties(fileType.ToMacFileType(), props);
using (var s = imageData.AsStream()) {
s.CopyTo(stream);
}
}
public static void SaveToFile(this NSImage image, string path)
{
//NSBitmapImageRep *imgRep = [[image representations] objectAtIndex: 0];
//NSData *data = [imgRep representationUsingType: NSPNGFileType properties: nil];
//[data writeToFile: @"/path/to/file.png" atomically: NO];
var imageData = image.AsTiff();
var imgRep = NSBitmapImageRep.ImageRepFromData(imageData) as NSBitmapImageRep;
var imageProps = new NSDictionary();
var data = imgRep.RepresentationUsingTypeProperties(NSBitmapImageFileType.Png, imageProps);
NSError error;
data.Save(path, false, out error);
data.Dispose();
imgRep.Dispose();
}
public override object ConvertToBitmap(ImageDescription idesc, double scaleFactor, ImageFormat format)
{
double width = idesc.Size.Width;
double height = idesc.Size.Height;
int pixelWidth = (int)(width * scaleFactor);
int pixelHeight = (int)(height * scaleFactor);
if (idesc.Backend is CustomImage)
{
var flags = CGBitmapFlags.ByteOrderDefault;
int bytesPerRow;
switch (format)
{
case ImageFormat.ARGB32:
bytesPerRow = pixelWidth * 4;
flags |= CGBitmapFlags.PremultipliedFirst;
break;
case ImageFormat.RGB24:
bytesPerRow = pixelWidth * 3;
flags |= CGBitmapFlags.None;
break;
default:
throw new NotImplementedException("ImageFormat: " + format.ToString());
}
var bmp = new CGBitmapContext(IntPtr.Zero, pixelWidth, pixelHeight, 8, bytesPerRow, Util.DeviceRGBColorSpace, flags);
bmp.TranslateCTM(0, pixelHeight);
bmp.ScaleCTM((float)scaleFactor, (float)-scaleFactor);
var ctx = new CGContextBackend {
Context = bmp,
Size = new CGSize((nfloat)width, (nfloat)height),
InverseViewTransform = bmp.GetCTM().Invert(),
ScaleFactor = scaleFactor
};
var ci = (CustomImage)idesc.Backend;
ci.DrawInContext(ctx, idesc);
var img = new NSImage(((CGBitmapContext)bmp).ToImage(), new CGSize(pixelWidth, pixelHeight));
var imageData = img.AsTiff();
var imageRep = (NSBitmapImageRep)NSBitmapImageRep.ImageRepFromData(imageData);
var im = new NSImage();
im.AddRepresentation(imageRep);
im.Size = new CGSize((nfloat)width, (nfloat)height);
bmp.Dispose();
return(im);
}
else
{
NSImage img = (NSImage)idesc.Backend;
NSBitmapImageRep bitmap = img.Representations().OfType <NSBitmapImageRep> ().FirstOrDefault();
if (bitmap == null)
{
var imageData = img.AsTiff();
var imageRep = (NSBitmapImageRep)NSBitmapImageRep.ImageRepFromData(imageData);
var im = new NSImage();
im.AddRepresentation(imageRep);
im.Size = new CGSize((nfloat)width, (nfloat)height);
return(im);
}
return(idesc.Backend);
}
}
private static DataPackageView GetFromNative(NSPasteboard pasteboard)
{
if (pasteboard is null)
{
throw new ArgumentException(nameof(pasteboard));
}
var dataPackage = new DataPackage();
// Extract all the standard data format information from the pasteboard items.
// Each format can only be used once; therefore, generally the last occurrence of the format will be the one used.
foreach (NSPasteboardItem item in pasteboard.PasteboardItems)
{
if (item.Types.Contains(NSPasteboard.NSPasteboardTypeTIFF) ||
item.Types.Contains(NSPasteboard.NSPasteboardTypePNG))
{
// Images may be very large, we never want to load them until they are needed.
// Therefore, create a data provider used to asynchronously fetch the image.
dataPackage.SetDataProvider(
StandardDataFormats.Bitmap,
async cancellationToken =>
{
NSImage?image = null;
/* Some apps, including Photos, don't appear to put image data in the pasteboard.
* Instead, the image URL is provided although the type indicates it is an image.
*
* To get around this an image is read as follows:
* (1) If the pasteboard contains an image type then:
* (2) Attempt to read the image as an object (NSImage).
* This may fail as some tested apps provide a URL although declare an image (Photos).
* With other apps (such as web browsers) an image will be read correctly here.
* (3) If reading as an NSImage object fails, attempt to read the image from a file URL (local images)
* (4) If reading from a file URL fails, attempt to read the image from a URL (remote images)
*
* Reading as an NSImage object follows the docs here:
* https://docs.microsoft.com/en-us/xamarin/mac/app-fundamentals/copy-paste#add-an-nsdocument
*/
var classArray = new Class[] { new Class("NSImage") };
if (pasteboard.CanReadObjectForClasses(classArray, null))
{
NSObject[] objects = pasteboard.ReadObjectsForClasses(classArray, null);
if (objects.Length > 0)
{
// Only use the first image found
image = objects[0] as NSImage;
}
}
// In order to get here the pasteboard must have declared it had image types.
// However, if image is null, no objects were found and the image is likely a URL instead.
if (image == null &&
item.Types.Contains(NSPasteboard.NSPasteboardTypeFileUrl))
{
var url = item.GetStringForType(NSPasteboard.NSPasteboardTypeFileUrl);
image = new NSImage(new NSUrl(url));
}
if (image == null &&
item.Types.Contains(NSPasteboard.NSPasteboardTypeUrl))
{
var url = item.GetStringForType(NSPasteboard.NSPasteboardTypeUrl);
image = new NSImage(new NSUrl(url));
}
if (image != null)
{
// Thanks to: https://stackoverflow.com/questions/13305028/monomac-best-way-to-convert-bitmap-to-nsimage/13355747
using (var imageData = image.AsTiff())
{
var imgRep = NSBitmapImageRep.ImageRepFromData(imageData) as NSBitmapImageRep;
var data = imgRep !.RepresentationUsingTypeProperties(NSBitmapImageFileType.Png, null);
return(new RandomAccessStreamReference(async ct =>
{
return data.AsStream().AsRandomAccessStream().TrySetContentType("image/png");
}));
}
}
else
{
// Return an empty image
return(new RandomAccessStreamReference(async ct =>
{
var stream = new MemoryStream();
stream.Position = 0;
return stream.AsRandomAccessStream().TrySetContentType("image/png");
}));
}
});
}
if (item.Types.Contains(NSPasteboard.NSPasteboardTypeHTML))
{
var html = item.GetStringForType(NSPasteboard.NSPasteboardTypeHTML);
if (html != null)
{
dataPackage.SetHtmlFormat(html);
}
}
if (item.Types.Contains(NSPasteboard.NSPasteboardTypeRTF))
{
var rtf = item.GetStringForType(NSPasteboard.NSPasteboardTypeRTF);
if (rtf != null)
{
dataPackage.SetRtf(rtf);
}
}
if (item.Types.Contains(NSPasteboard.NSPasteboardTypeFileUrl))
{
// Drag and drop will use temporary URLs similar to: file:///.file/id=1234567.1234567
var tempFileUrl = item.GetStringForType(NSPasteboard.NSPasteboardTypeFileUrl);
// Files may be very large, we never want to load them until they are needed.
// Therefore, create a data provider used to asynchronously fetch the file.
dataPackage.SetDataProvider(
StandardDataFormats.StorageItems,
async cancellationToken =>
{
// Convert from a temp Url (see above example) into an absolute file path
var fileUrl = new NSUrl(tempFileUrl);
var file = await StorageFile.GetFileFromPathAsync(fileUrl.FilePathUrl.AbsoluteString);
var storageItems = new List <IStorageItem>();
storageItems.Add(file);
return(storageItems.AsReadOnly());
});
}
if (item.Types.Contains(NSPasteboard.NSPasteboardTypeString))
{
var text = item.GetStringForType(NSPasteboard.NSPasteboardTypeString);
if (text != null)
{
dataPackage.SetText(text);
}
}
if (item.Types.Contains(NSPasteboard.NSPasteboardTypeUrl))
{
var url = item.GetStringForType(NSPasteboard.NSPasteboardTypeUrl);
if (url != null)
{
DataPackage.SeparateUri(
url,
out string?webLink,
out string?applicationLink);
if (webLink != null)
{
dataPackage.SetWebLink(new Uri(webLink));
}
if (applicationLink != null)
{
dataPackage.SetApplicationLink(new Uri(applicationLink));
}
// Deprecated but still added for compatibility
dataPackage.SetUri(new Uri(url));
}
}
}
return(dataPackage.GetView());
}